- Add CostInterval type and PAYMENTS_PER_YEAR constant
- Add 7 TCO fields to Vehicle, CreateVehicleRequest, UpdateVehicleRequest
- Update VehicleResponse and Body types
- Update mapRow() with snake_case to camelCase mapping
- Update create(), update(), batchInsert() for new fields
- Add Zod validation for TCO fields with interval enum
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
